Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Protection types
5 Constructional requirements for pressurized enclosures
   5.1 Enclosure
   5.2 Materials
   5.3 Doors and covers
   5.4 Mechanical strength
   5.5 Apertures, partitions, compartments and internal
       components
   5.6 Insulating materials
   5.7 Sealing
   5.8 Spark and particle barriers
6 Temperature limits
   6.1 General
   6.2 For type px or type py
   6.3 For type pz
7 Safety provisions and safety devices (except for
   static pressurization)
8 Safety provisions and safety devices for static
   pressurization
9 Supply of protective gas
   9.1 Type of gas
   9.2 Temperature
10 Pressurized apparatus with an internal source of
   release
11 Release conditions
   11.1 No release
   11.2 Limited release of a gas or vapour
   11.3 Limited release of a liquid
12 Design requirements for the containment system
   12.1 General design requirements
   12.2 Infallible containment system
   12.3 Containment system with a limited release
13 Protective gas and pressurizing techniques
   13.1 General
   13.2 Pressurization with leakage compensation
   13.3 Pressurization with dilution
14 Ignition-capable apparatus
15 Internal hot surfaces
16 Type verification and tests
   16.1 Maximum overpressure test
   16.2 Leakage test
   16.3 Purging test for pressurized enclosures with no
        internal source of release (pressurization
        technique may be leakage compensation or
        continuous flow) and filling procedure test for
        static pressurization
   16.4 Purging and dilution tests for a pressurized
        enclosure with an internal source of release
   16.5 Verification of minimum overpressure
   16.6 Tests for an infallible containment system
   16.7 Overpressure test for a containment system with a
        limited release
   16.8 Verifying ability of the pressurized enclosure to
        limit internal pressure
17 Routine tests
   17.1 Functional test
   17.2 Leakage test
   17.3 Tests for an infallible containment system
   17.4 Test for a containment system with a limited release
18 Marking
Annex A (normative) Purging and dilution tests
Annex B (informative) Examples of functional sequence diagram
Annex C (informative) Examples of the changes in pressure in
                      ducts and enclosures
Annex D (informative) Information to be provided to the user
Annex E (normative) Classification of the type of release
                      within enclosures
Annex F (informative) Examples for the use of the dilution area
                      concept
Annex G (normative) Infallibility test for containment system
Annex ZA (normative) Normative references to international
                      publications with their corresponding
                      European publications
Bibliography
Figures
Tables